﻿#region Copyright and Licensing Notice
// Copyright (C) 2011 Steven Bosnick
// 
// This program is open source software; you can redistribute it 
// and/or modifiy it under the terms of the Eclipse Public License,
// version 1.0.
// 
// This program is distributed in the hope that it will be useful, 
// but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A 
// PARTICULAR PURPOSE. See the Eclipse Public License for more
// details.
// 
// You should have received a copy of the Eclipse Public License 
// along with this program; if not, you can find a copy at
// "http://www.opensource.org/licenses/eclipse-1.0.php".
#endregion
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace BitwiseOre.SharedMemory.Core.Primatives
{
    internal static class EnumerableExtensions
    {
        public static IEnumerable<T> ToRingBuffer<T>(this ReadOnlyCollection<T> collection)
        {
            return from index in Repeat(Enumerable.Range(0, collection.Count))
                   select collection[index];
        }

        // ReSharper disable FunctionNeverReturns
        private static IEnumerable<T> Repeat<T>(this IEnumerable<T> enumerable)
        {
            while (true)
            {
                foreach (var item in enumerable)
                {
                    yield return item;
                }
            }
        }
        // ReSharper restore FunctionNeverReturns
    }
}